It's a rainy day at the Mystery Shack, while Dipper and Mabel are playing Conflict Boat.

Dipper smiled, "I'm gonna say... B5."

"Miss!" Mabel puts a peg on her board, "Whop!"

Mabel's board, has her pegs arranged like a kitten's face.

Dipper sighed, "I don't think you're playing this right."

Stan screams, "Kids! Come quick!"

Dipper, Mabel, and Will enter the living room to find Stan watching television.

Stan laughs, "I need you to laugh at this with me!"

A commercial for the Tent of Telepathy comes on the television.

Gideon Gleeful sings, "Who's cute as a button, and always your friend? Lil' G-I-D to the E-O-N! Wink!"

Bud Gleeful smiled, "Li'l Gideon!"

"Gideon..." Will frowned.

Mabel frowned, "Remember when I wouldn't date him and he tried to destroy us?"

"He's always trying to trick me into losing the Mystery Shack," Stan states.

Wendy frowned, "One time I caught him stealing my moisturizer."

"And yet, our mutual hatred for him bonds us together," Soos smiled.

Bud announced, "Come on down to Li'l Gideon's Tent of Telepathy, opening soon at this location."

Commercial shows the Tent of Telepathy crushing the Mystery Shack.

"Uh, should we be worried about that?" Dipper asked.

Stan laughed, "Please, the only way Gideon's taking over this shack is by breaking in and stealing my deed."

A crash is heard from upstairs.

"You mean like, right now?" Wendy asked.

Gideon is attempting to open Stan's safe.

Gideon frowned, "38? 41? Oh, heavens to Betsy!"

"Gideon!" Stan shouted.

Gideon smiled, getting up, "Well, well, Stanford, my arch-nemesis. We seem to have entered a dangerous game of cat and mouse. But the question remains, who is the cat, and who is the-" "-Soos, broom," Stan interrupts.

Gideon gulped, "Oh no, not the broom!"

Stan chases Gideon around the room with the broom. Gideon hisses at him. Stan hits Gideon with the broom twice before chasing him outside.

Gideon scowled, "You mark my words, Stanford, one day I'm gonna get that combination. And once I steal that deed, you'll never see the Mystery Shack again!"

"Good luck, bucko!" Stan laughed.

Stan laughed, "The combo to this safe is in the one place he'll never find it: my brain."

"... I hope it stays that way..." Will whispers to himself, playing with his hands nervously.

Gideon smiled, "Your brain isn't as safe as you might think, Stanford Pines!" He pulls out Journal 2, "This is the last straw! It's time to unlock the journal's greatest secret..."

It's a picture of a triangle with a top hat and bow tie, surrounded by many different symbols.

Dipper, Mabel, Stan, Will, and Wendy are watching television. Dipper and Wendy are shooting each other with Nyarf brand dart guns.

He put the old in "old west," they call him (musically) Grandpa the Kid!

Grandpa the Kid, "I'm tired during the day."

Stan smiled, "I can relate to this."

"Grunkle Stan, why can't we watch a movie that we'll all enjoy? Dream Boy High! 'Where love is on your permanent record'." Mabel smiled, holding out a movie case.

Everyone else boos at the movie.

Mabel smiled, "You'll learn to like it."

A crash is heard from the kitchen.

Soos runs into the room, "Aaah! Dudes, there's a bat in the kitchen! It tried to touch me with its 'weird little bat fingers'!"

"Don't worry, I got this under control." Stan leans back in his armchair, "Dipper, take care of it."

Mabel laughs, "Yes!"

"What? Why can't Mabel do it?" Dipper asked.

Stan grinned, 'Cause life ain't fair. Now go fight a bat so we can watch TV."

"No way, Grunkle Stan! You always make me do dumb chores. I'm putting my foot down this time!" Dipper stamps his foot on the carpet.

Stan growls, "I said do it kid. Now!"

Old west music plays.

Stan and Dipper have a stare off, growling at each other. Stan wins.

"Okay, I'll do it!" Dipper sighs, walks into kitchen, Mabel following behind him. He picks up a saucepan and spoon on the floor, mumbling, "Stupid chores..."

Mabel smiled, "Remember, bats are more afraid of you than you are of them. Maybe I'm thinking of ducklings."

Loud screams and crashes come from the kitchen, while kitchen supplies and Dipper's hat are thrown outside.

"Ducklings." She laughs, "Quack quack! Quack quack quack!"

Soos is applying disinfectant to Dipper's wounds, while Mabel applies bandages to Dipper's head.

"Ow, ow!" Dipper shouts, wincing at the pain.

Soos sings, "Swabbing on disinfectant, doo doo doo..."

"Why does Grunkle Stan always pick on me? Think about it! The more painful or difficult the chore is, the more likely it is I'll have to do it. Why doesn't he pick on you guys?" Dipper asked.

Soos smiled, "Dipper, Stan's personality is one of life's great mysteries. Like whether or not it's possible to lick your own elbow."

"I bet you can't!" Mabel shouts.

Soos shouts, "I bet I can!" He tries to lick his elbow and walks away.

Mabel follows Soos, chanting, "Lick it! Lick it! Lick it!"

"Sometimes I feel like Stan hates me..." He looks up to a picture of Stan on the wall.

"The sink's clogged. Dipper, get in here and fix it!"

Dipper growls, grabbing his Nyarf dart gun and fires it at the picture.

Its same picture of Stan, except with a red "X" painted over his eyes and surrounded by candles.

"You think that combination's safe in your mind, Stanford? We'll see what my new minion has to say about that!" Gideon starts to chant, "Triangulum, entangulum. Vene foris dominus mentium. Vene foris videntis omnium!"

Mabel and Soos are outside, Soos is still attempting to lick his own elbow, with Mabel still chearing him on.

Mabel chants, "Lick that elbow! Lick that elbow!"

"Like the infinite horizon, it eludes my grasp," Soos states.

Gideon laughs.

Mabel frowned, "Is that who I think it is?"

Mabel and Soos walk toward Gideon.

Gideon starts chanting again, "Egassem sdrawkcab. egassem sdrawkcab. Egassem sdrawkcab! Egassem sdrawkcab! Egassem sdrawkcab!"

The background turns black and white, wildlife pauses in midair and Bill Cipher appears.

Will yelps, noticing that time had suddenly stopped and that everything was in greyscale. He bits his lip, before running out of the shack, and then noticing Mabel and Soos by a bush, and then goes behind with them. He starts digging into the inside of his bottom lip, when he notices what's in the sky. He starts breathing heavily, too.

Bill laughed, "Oh, oh, Gravity Falls! It is good to be back. Name's Bill Cipher, and I take it you're some kind of living ventriloquist dummy? I'm just kidding, I know who you are, Gideon!"

"W-what are you? H-how do you know my name?" Gideon yelps I'm surprise.

"Oh, I know lots of things! LOTS OF THINGS..." He says slowly, "Hey, look what I can do!" He gestures toward a deer, the deer's teeth then fly into his hand. Gives the teeth to Gideon, "Deer teeth! For you, kid!" He laughs.

Gideon cries out in shock and drops teeth on the ground, "You're insane!"

Bill laughed, "Sure I am, what's your point?" He puts the teeth back in deer's mouth and the deer runs away.

"Listen to me, demon! I have a job for you. I need you to enter the mind of Stanford Pines and steal the code to his safe," Gideon growls.

Mabel and Soos both gasp, and Will just looks down at the grass.

Bill laughs, "Wait... Stan Pines? You know what, kid? You've convinced me! I'm sold! I'll help you with this and in return you can help me with something I've been working on! We'll work out the details later."

"Deal!" Gideon says.

Will shakes his head, whispering to himself, "That isn't a good idea..."

Bill 's hand lights on blue fire and he shakes hands with Gideon, "Well, time to invade Stan's mind! This should be fun! Remember: reality is an illusion, the universe is a hologram, buy gold, bye!"

"It worked!" Gideon laughs maniacally.

The three look at each other, before running to the shack.

Dipper sweeps the carpet in the living room while Stan sleeps in his chair.

Stan, mumbling in his sleep, "Oh, I'm so sorry."

Dipper frowned, "What is going on in that guy's head?" He begins to walk away.

Mabel, Will, and Soos run in.

Mabel shouts at him, "Dipper! We've gotta help Stan!"

"Wait, what?" Dipper asked, looking back at Stan.

Soos, eating Nyums brand Burrito Bites, "This evil triangle guy said he's gonna break into Stan's mind and steal the combination to his safe! Also, we stopped for snacks on the way here."

Will just glares at him, shaking his head.

"Triangle guy?" Dipper takes out Journal 3, "I feel like I've seen something like this before in the journal..." He begins to read from the journal, " 'Beware Bill, the most powerful and dangerous creature I've ever encountered. Whatever you do, never let him enter your mind'."

Dipper, Mabel and Soos gasp.

Mabel frowned, "Grunkle Stan!" She takes the journal from Dipper and begins to read, " 'It is possible to follow the demon into a person's mind and prevent his chaos. One must simply recite this incantation'."

"Ugh, this is just great. I spend all day cleaning sinks and fighting bats for Stan and now I have to save him from some crazy brain demon?" Dipper grumbled.

Will bit his lip, looking down.

Mabel frowned, "But if we don't do anything Gideon might steal the shack! Or worse!"

Stan screams.

Dipper sighs, "Fine. Get ready, guys. We're about to journey into the most horrifying, disturbing place any of us have ever been: our uncle's mind."

Lightning flashes.

"You think I can take these Burrito Bites into Stan's brain? Thumbs up? Thumbs down?" Soos pauses; laughs, "You know what, I'm just gonna bring 'em."

Dipper, Mabel, Will and Soos stand around a sleeping Stan in the living room with the lights off and surrounded by a circle of candles

Dipper, holding Journal 3, "Okay, guys, in order to save our uncle, we're gonna have to follow that... dream demon into his mind."

"I wonder what Stan's thinking about right now." Soos uses Stan as a ventriloquist dummy, in a high voice, "I love Soos like a son!"

Dipper glares at him, "Soos! This is serious!"

Soos, still using Stan's mouth in a high voice, "Sorry!"

Mabel and Soos laugh, "Yeah!" They high five each other.

"Let's do this." Dipper puts his hand on Stan's hand.

Mabel and Soos also put their hands on Stan's head. Will shakily puts his hand on Stan's hand as well.

Dipper starts chanting, reading from journal, "Videntus omnium. Magister mentium. Magnesium ad hominem. Magnum opus. Habeas corpus! Inceptus Nolanus overratus! Magister mentium! Magister mentium! MAGISTER MENTIUM!"

As Dipper speaks, his eyes go blue, then Soos', then Mabel's and the candles go out, and after the incantation, there is a blue explosion and the gang is inside Stan's mind.

A/N: Please leave a review! Reviews are the only thing that truly tell me that people are reading my story, and that I should continue! Also... I kinda need a little help with what could happen, even though this is one of my favorite episodes. - K.